Drive Torx-head fasteners with confidence using the Century Drill T40 star insert bit. The S2 tool steel body is heat-treated to 58-62 HRC, giving an ideal balance of hardness and toughness - resisting wear while flexing rather than shattering under high torque. T40 is the heavy-structural size for long ledger and post-frame screws.

• S2 tool steel, heat-treated to 58-62 HRC
• 1" overall length, 1/4" hex shank
• Fits hand drivers, 1/4" hex bit holders, impact-ready chucks, and quick-change collets
• Precision-machined tip for secure fastener engagement
• T40 size for heavy structural wood screws (LedgerLok 6" / TimberLok 8-10", HeadLok 6"+), large lag screws, and heavy automotive/equipment fasteners
• MPN 68440 (Century 684XX Torx insert bit family: last 2 digits = Torx number)

Tip: Seat the bit fully in the recess before applying torque. T40 screws regularly stall 12V drills - use a corded drill or high-torque impact (DeWalt DCF887, Milwaukee 2853, Makita XDT16 class) to drive to flush without cam-out.